ABSTRACT
ABSTRACT: A unified approach of numerical simulation is presented to analyze the interaction of flight dynamics and aeroelasticity of flexible aircraft. Using an unsteady aerodynamic reduced-order model (ROM) based on computational fluid dynamics (CFD), an efficient numerical simulation is proposed to simulate the dynamic response of flexible aircraft and determine flight dynamic stability characteristics from dynamic responses in the time domain. The numerical results show that strong interacting between the short-period modes of flight dynamics and the structural elastic modes of low natural frequency will impair the stability of flexible planes with high aspect-ratio wings and flexible missiles with high slenderness-ratio bodies. Two numerical simulations confirm the effectiveness and efficiency of ROM in relation to the full CFD method. The simulation yields satisfactory numerical results in the engineering field and improves the computational efficiency up to two orders of magnitude.
